| ??? 12/18/04 08:53 Read: times |
#83395 - Chip manufacturer changed? Responding to: ???'s previous message |
Jan Waclawek said:
Once we decided to remake the board for SMD. My younger colleague replaced the 74LS parts with more modern, faster, better 74HC part... And sure it stopped working. well you changed the family and it stopped working. I have the experience of changing the chip manufacturer (for an HC chip, I don't remember the part number exactly) from TI to Motorola and the same board stopped working. The chip was on socket (same board for both chips) and rest of parts were also same. Both chips were fine when tested standalone. Anyway very interesting thread, Joseph. |
| Topic | Author | Date |
| Weekend On-Topic (WOnT) | 01/01/70 00:00 | |
| microsoft ?? | 01/01/70 00:00 | |
| Cute ;) | 01/01/70 00:00 | |
| Weekend on Topic | 01/01/70 00:00 | |
| A very reasonable hypothesis | 01/01/70 00:00 | |
| happened here | 01/01/70 00:00 | |
| The chip changed | 01/01/70 00:00 | |
| What happened? | 01/01/70 00:00 | |
| Also an excellent hypothesis | 01/01/70 00:00 | |
| too much | 01/01/70 00:00 | |
| Nah. | 01/01/70 00:00 | |
| Me too, But | 01/01/70 00:00 | |
| systematic debugging | 01/01/70 00:00 | |
| Pb-free? | 01/01/70 00:00 | |
| Did the temp characteristics change? | 01/01/70 00:00 | |
| another one from memory | 01/01/70 00:00 | |
| What it's not. | 01/01/70 00:00 | |
| Solution | 01/01/70 00:00 | |
| Speed! | 01/01/70 00:00 | |
| Speed | 01/01/70 00:00 | |
| Would get the oscope, first | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| What it is? | 01/01/70 00:00 | |
| Think volume | 01/01/70 00:00 | |
| Not a puzzle!! | 01/01/70 00:00 | |
| Apologies | 01/01/70 00:00 | |
| Re: | 01/01/70 00:00 | |
| Y2K-and-something | 01/01/70 00:00 | |
| Y2K + something | 01/01/70 00:00 | |
| Y2k05 | 01/01/70 00:00 | |
| The Unix Epoch and the Year 2038 | 01/01/70 00:00 | |
| Yet another true story... | 01/01/70 00:00 | |
| A perfect example | 01/01/70 00:00 | |
| Newer IC | 01/01/70 00:00 | |
| Answer time...? | 01/01/70 00:00 | |
| another guess | 01/01/70 00:00 | |
| language | 01/01/70 00:00 | |
| Faster does not mean better! | 01/01/70 00:00 | |
| Ok | 01/01/70 00:00 | |
| Gladly | 01/01/70 00:00 | |
| To tell the whole truth... | 01/01/70 00:00 | |
| Hidden parameters | 01/01/70 00:00 | |
| Parasitic parameters | 01/01/70 00:00 | |
| Chip manufacturer changed? | 01/01/70 00:00 | |
| Faster/slower or "controlled" rise time | 01/01/70 00:00 | |
| Answer | 01/01/70 00:00 | |
| Amazing.... | 01/01/70 00:00 | |
| Amazed | 01/01/70 00:00 | |
| Split Planes | 01/01/70 00:00 | |
| A bit disappointed... | 01/01/70 00:00 | |
| Series resistors and line matching | 01/01/70 00:00 | |
| Series termination resistors | 01/01/70 00:00 | |
| Series termination | 01/01/70 00:00 | |
| SWR | 01/01/70 00:00 | |
| simulation to the rescue | 01/01/70 00:00 | |
| Thanks! | 01/01/70 00:00 | |
| The same moment? | 01/01/70 00:00 | |
| The same moment! | 01/01/70 00:00 | |
I'm Back. | 01/01/70 00:00 |